Robert e



R. E, DIETZ. STEAM BOILER.

(No Model.)

Patented Maryl, 1894.

1m mf; Wm Mm n UNrrn raras ROBERT E. DIETZ, OF NEW YORKN. Y., ASSIGNOR OF ONE-THIRD 'IO y WILLIAM K. PALMER, OF SAME PLACE.`

STEAM -BO I'LER.

SPECIFICATION forming part of Letters Patent No. 516,369, dated March 13, 1,894. Application iilod April 2. 1.892. `Serial No. 427,558. (No model.)`

amount offuel required, and give a more complete consumption of the products of combustion, over theboilers heretofore in use.

The invention consists in the combination of a tubular or flue boiler with a ue or passage for heat, or products of combustion located beneath the boiler, and a heat chamber.

over the boiler; the former flue or passage connects with the boiler ilues at one end of the boiler, and the heat chamber being connected with the opposite end of the boiler,

whereby the heat or products of combustion' will pass under the boiler, through it and over it, andbe wholly utilized by the time it reaches the uptake.

The invention also consists in a steam regulated damper to control the passage of the heat or products of combustion; also, in the novel details of improvement and combination of parts that will be more fnl] y hereinafter set forth and then pointed out in the claims.

In order that the exact nature of the construction may be easily understood, the following drawings are annexed. ,A

Figure l, is a vertical longitudinal section of a boiler setting disclosing my invention. Fig. 2, is a cross section on the line X X Fig. 1. Fig. 3, is a detail sectional view of the damper regulator'. Fig. 4, is a'diagrammatic view of the boiler and bridge-wall.

In the accompanying drawings A, indicates a tubular or iue boiler having the fines open at both ends. Said boiler is suitably mounted in a suitable casing or setting B, a passage or flue being formed beneath the boiler, and a heat-chamber being situated over the boiler. There is no communication between the chamber D, and the heat-chamber E, at the sides of the boiler, they being wholly separated as' shown in Fig. 2. The heat-chamber E, communicates at one end to the uptake F, in which may be a dampera. At the front end of the boiler thel fire box or grate b, communicates with the chamber D, and at the opposite end the chamber D, communicates with the ilues of the boiler A. The back part of the chamber D, is completely sh-ut oft' from the heat-chamber E, say by a partition or jacket d. A door e in the rear casing B, permits access to the ues of the boiler for cleaning, also to the bridge wall G,'Which is shown solid to prevent the dissipation of heat. The forward ends of the ilues of the boiler communicate with the heat-chamber E, through a passage E2, whichis formed by a lshield or cover H,`and is preferably hinged so as to be lifted to permit accessy to the boiler flues.

The steam dome I, passes through the h eatchamber E.

In 'operation the heat, or products of combustion, pass from the fuel D2, over the bridge f thel upper side of the boiler and the steamr dome I. By the foregoing varrangement the heat or products of combustion are caused to traverse the boiler for a distance equal to about three times its length, thus tending to give a more perfect combustion, and at the same time the greater part of the heat will be applied to and absorbed by the boiler. By my improvement a great saving in fuel can be effected, as the major portion of the heat generated is absorbed by thev boiler and its contents, the products that pass off through the uptake F, being comparatively cool.

J, is a damper adapted to close the chamber E, (as shown in dotted lines in Fig. l.) This damper is shown pivoted as atj, and connected by a crank Z, and rod m, with a lever fn, having an adjustable weight o, (see Fig. 3.) This lever n, is jointed as at p, the weight o, is acted upon by a piston rod q, secured to a diaphragm 1, in the steam' cylinder L, which is connected tothe steam dome I, by thepipe s. The weight o, can beset sov that when the vsteam in the boiler A, has reached a certain pressure, the diaphragm rr', in the steam cylinder L, will be forced upward, lift the lever ln., and swing the damper J, shut, closing the heat-chamber E, so as to damp the fire. By this means the steam lis prevented from exceeding the desired pressure, which must re- ;sult in a saving of fuel.

In Fig. 4, I have shown in diagram a modified form of bridge Wall, that is, the upper surface of the wall is flat and extends horizontally from one side of the casing B, to the opposite side, at the desired distance beneath the boiler A.

With my improved boiler I am enabled to reach a nearer state of perfect combustion than has ever yet been obtained, thus:-by causing the heat or products of combustion to travel about three times the length of the boiler, little if any smoke is thrown oit.

Having thus described my invention, what I claim is- 1. In combination Withaboiler having flues, the automatic damper J, dependent from the 

